The ATP Automotive Graywerks 101122 Exhaust Manifold/Catalytic Converter is a direct OE replacement designed to bolt onto your existing exhaust system without requiring custom fabrication or modifications. Because it is engineered to align and flow like the original unit, the installation is intended to be a direct swap for the factory component. We selected this specific manifold for our comparison because it includes the necessary hardware to simplify the swap process.
The Graywerks 101122 includes upper and lower flange gaskets as well as lower flange hardware, which eliminates the need to source separate mounting pieces. It is constructed from high-grade steel and precious metals to restore emission levels and prevent the check engine light from triggering due to catalytic converter issues. For an exhaust manifold converter—which is a heavy metal pipe that directs engine gases into a filtration unit—ensuring a precise fit is critical because even a slight misalignment in the port geometry can lead to exhaust leaks or cracked headers. This specific unit was developed based on OEM ECU monitors to ensure the vehicle’s computer accepts the change in backpressure without requiring a software tune. While the manifold is a bolt-on part, you must verify that your specific engine block casting matches the manifold’s geometry to prevent port mismatches where the tubes do not align with the cylinder heads.
What to Check Before Buying the Graywerks 101122
Before ordering, verify these specific details to ensure the manifold seats correctly and functions as intended:
- Confirm that the outlet diameter of the manifold matches your existing downpipe or mid-pipe to avoid needing custom welding.
- Verify that there are no heat shield interference points in your engine bay that would prevent the manifold from seating flush against the head.
- Check your owner’s manual or the manufacturer’s compatibility page for specific torque sequences required to prevent the manifold from cracking under heat cycles.
- Verify that your vehicle’s specific engine block casting is compatible with this manifold‘s port layout to ensure a proper seal.
Comparing the Graywerks 101122 to Other Exhaust Manifolds
The Graywerks 101122 is a high-grade steel replacement designed for those who prioritize restoring original factory performance and emissions. Because it functions as a direct OE replacement, it is ideal for buyers who want a “set and forget” solution that maintains the original vehicle’s specifications. If you require a high-flow ceramic substrate for significant performance gains or a custom-fabricated manifold for a non-standard engine layout, you may need to look at aftermarket performance manifolds instead of this direct replacement. For those seeking a simple restoration of factory standards, this model provides the necessary hardware and material quality to meet those goals.
If you are shopping for a different vehicle, see the top-rated Hyundai Santa Fe Sport converter options.
If you need a direct replacement that restores factory emissions and includes all necessary mounting hardware, the Graywerks 101122 is the appropriate choice for your vehicle.
ATP Automotive Graywerks 101122 Exhaust Manifold
Owners of a different vehicle can view our comparison of Hyundai Santa Fe Sport exhaust components.
$157.99 price checked August 2026
The rest of our Exhaust Manifold Converter guides
- Which Exhaust Manifold Catalytic Converter is Best for a Jeep Wrangler?
- Best Exhaust Manifold Catalytic Converters for Hyundai Santa Fe Sport
- Exhaust Manifold Catalytic Converters for Toyota Camry Compared
- Choosing the Best Exhaust Manifold Catalytic Converter for Nissan Altima
- The Exhaust Manifold Catalytic Converters That Work Best for Honda Civic